[PEFT]Add LoRA-GA

paddlenlp/peft/lora/lora_config.py

@@ -76,6 +76,7 @@ class LoRAConfig:
     do_qat: bool = field(default=False, metadata={"help": "Whether the lora model would do quant-aware training"})
     rslora: bool = field(default=False, metadata={"help": "Whether to use RsLoRA"})
     pissa: bool = field(default=False, metadata={"help": "Whether to use Pissa: https://arxiv.org/pdf/2404.02948.pdf"})
+    loraga: bool = field(default=False, metadata={"help": "Whether to LoRA-GA"})
     lora_plus_scale: float = field(default=1.0, metadata={"help": "Lora B scale in LoRA+"})
     base_model_name_or_path: Optional[str] = field(
         default=None, metadata={"help": "The name of the base model to use."}

paddlenlp/peft/lora/lora_model.py

@@ -163,6 +163,9 @@
             )
 
         self.forward = self.model.forward
+        if lora_config.loraga:
+            self.loraga_init_dict = {}
+            self.reinit_base_model = False
 
         logger.info("Mark only lora and trainable_module as trainable.")
         self.mark_only_lora_as_trainable()
@@ -269,7 +272,7 @@
                     tp_actions if pre_tensor_parallel_split else None,
                     expected_keys,
                 )
-                error_msgs += _load_state_dict_into_model(lora_model.model, state_dict, "")
+                error_msgs += _load_state_dict_into_model(lora_model, state_dict, "")
                 del state_dict
                 gc.collect()
 
@@ -319,6 +322,41 @@
         warnings.filterwarnings(
             action="ignore", message=".*Skip loading for.*", category=Warning, lineno=0, append=False
         )
+
+        model_state_dict = self.model.state_dict()
+        if self.lora_config.loraga:
+
+            def process_split_and_assign(name, concat_tensor, axis, init_dict, state_dict):
+                if isinstance(concat_tensor, np.ndarray):
+                    final_lora, init_lora = np.split(concat_tensor, 2, axis=axis)
+                    init_lora = paddle.to_tensor(init_lora)
+                else:
+                    final_lora, init_lora = paddle.split(concat_tensor, 2, axis=axis)
+                init_dict[name] = init_lora
+                state_dict[name] = final_lora
+                return init_lora
+
+            for name in state_dict.keys():
+                if "lora_A" in name:
+                    concat_lora_A = state_dict[name]
+                    init_loraA = process_split_and_assign(
+                        name, concat_lora_A, axis=1, init_dict=self.loraga_init_dict, state_dict=state_dict
+                    )
+
+                    loraB_name = name.replace("lora_A", "lora_B")
+                    concat_lora_B = state_dict[loraB_name]
+                    init_loraB = process_split_and_assign(
+                        loraB_name, concat_lora_B, axis=0, init_dict=self.loraga_init_dict, state_dict=state_dict
+                    )
+
+                    base_name = name.replace("lora_A", "weight")
+                    if not self.reinit_base_model:
+                        # Reinit base model
+                        offset = init_loraA.cuda() @ init_loraB.cuda()
+                        ori_weight = model_state_dict[base_name]
+                        model_state_dict[base_name].set_value(ori_weight - self.lora_config.scaling * offset)
+        del model_state_dict
+        gc.collect()
         self.model.set_state_dict(state_dict)
         logger.info("Load lora weight successfully")
 
@@ -400,8 +438,9 @@
 
         lora_config_to_save = LoRAConfig(**self.lora_config.to_dict())
 
+        trainable_state_dict = self.get_trainable_state_dict(concat_init_lora=lora_config_to_save.loraga)
+
         if merge_tensor_parallel and lora_config_to_save.tensor_parallel_degree > 1:
-            trainable_state_dict = self.get_trainable_state_dict()
             trainable_state_dict = self._merge_trainable_tensor_parallel(trainable_state_dict)
             if not is_main_process:
                 logger.info("Saving with merge_tensor_parallel, tensor_parallel_rank > 0 don't need save")
@@ -410,7 +449,6 @@
                 variant = "_".join([x for x in variant.split("_") if "tp" not in x])
             lora_config_to_save.tensor_parallel_degree = -1
         else:
-            trainable_state_dict = self.get_trainable_state_dict()
             if lora_config_to_save.tensor_parallel_degree > 1:
                 if variant is None:
                     variant = weight_name_suffix()
@@ -641,12 +679,19 @@
             original_module.bias = module.bias
         setattr(parent_module, attribute_chain[-1], original_module)
 
-    def get_trainable_state_dict(self):
+    def get_trainable_state_dict(self, concat_init_lora=False):
         trainable_state_dict = OrderedDict()
         for name, weight in self.model.state_dict().items():
             # get lora parameter & QAT scale parameter
             if not weight.stop_gradient or "activation_quanter" in name or "weight_quanter" in name:
-                trainable_state_dict[name] = weight
+                if concat_init_lora:
+                    if "lora_A" in name:
+                        trainable_state_dict[name] = paddle.concat([weight, self.loraga_init_dict[name]], axis=1)
+                    else:
+                        trainable_state_dict[name] = paddle.concat([weight, self.loraga_init_dict[name]], axis=0)
+                else:
+                    trainable_state_dict[name] = weight
+
         return trainable_state_dict
 
     def print_trainable_parameters(self) -> None: